Wavetek 145 Instruction Manual page 19

ECL and FUNCTION OUT connectors with ~n-
chronous-leading edges to the sync pulse
(!9)
trailing edge.
DOUBLE-As NORMAL plus an additional pulse
in each pulse period delayed from the first pulse
leading edge by time
@
DELA YEO-As NORMAL, except the pulse
leading edge is delayed from the normal pulse
leading edge by time
@
(j)
PULSE WIDTH Control
Outer knob selects the range for the width of all
pulses except sync. Has OFF and square wave
detents. When in OFF position, the 145 has no
PULSE OUT outputs. The square wave ( rti) de-
tent is normally used to check the 50% period
point; PULSE DELAY
@
has no effect. For the
best square wave output, set FUNCTION
G})
tori_
VARIABLE Control
Inner knob selects pulse width within the range
selected by the outer knob.
@
ATTENUATION Control
Outer knob reduces output voltage level of all
outputs at FUNCTION OUT with increasing
steps of attenuation.
VERNIER Control
Inner knob is a 20 dB vernier which controls the
output within the steps of the outer knob. DC and
offset voltages are not affected by this control.
@
FUNCTION OUT Connector
The only output for the functions other than fixed
amplitude pulse. At this output the functions and
pulses are controllable in amplitude and de off-
set; the other outputs furnish fixed amplitude
pulses only.
@)
SYNC OUT Connector
Furnishes a TTL pulse for each cycle or period of
the generator. To be used for scope or similar
synchronization. Refer to paragraph 3.2.1.4 for
conversion to an ECL ·sync pulse.
@
FUNCTION Switch
Selects one of eight output signals; de,
waveforms or pulses.
@
PULSE OUT
Four standard pulses for logic circuits as follows
(PULSE WIDTH
(j)
must be other than OFF):
TTL Connector-Furnishes a transistor-transistor-
logic level pulse whose occurence and duration
are controllable. Levels are typically
<
0.5V
quiescent,
>
2.0V active into a 500 termina-
tion.
TTL Connector-Same as TTL connector except
active and quiescent levels are reversed.
ECL Connector-Furnishes an emitter-coupled
logic level pusle with controllable occurence
and duration. Levels are typically -1.8V quies-
cent, - 0.9V active into a 500 termination con-
nector to - 2 volts. Refer to paragraph 3.2.1.3
for ECL loading instructions.
Ex
Connector-Furnishes an output like the
ECL output, except active and quiescent levels
are reversed.
@)
DC OFFSET Control
Offsets the waveform or de level at
@
from
approximately - 15V to + 15V (open circuit;
approximately ± 7 .5V into 500). An OFF position
ensures no offset.
@
TRIGGER START/STOP Control
Sets the start and stop point of the selected
waveform (sine or triangle only) appearing at
@
Usually used in the trigger mode and in com-
bination with
4}
to create desired
waveforms. 0° CAL position ensures conven-
tional waveforms symmetrical about O Vdc.
@
TRIG IN Connector
Accepts a 1 Vp-p to 1 0V external signal to trigger
the generator. (Up to
±
50V will not damage cir-
cuitry.) Triggers on rising edge of input which
crosses TRIGGER LEVEL
@
setting from
negative to positive.
@
VCG IN Connector
Accepts 0 to + 2V ac or de voltages to vary up to
1000:1 the frequency and period of the outputs.
3-3